Vector Equation E9B98C
1. **State the problem:**
Find the vector equation of the line given the symmetric equations:
$$\frac{x - 2}{3} = \frac{y - 2}{2} = \frac{z + 1}{4}$$
2. **Recall the formula:**
The symmetric form of a line is:
$$\frac{x - x_0}{a} = \frac{y - y_0}{b} = \frac{z - z_0}{c}$$
where $(x_0, y_0, z_0)$ is a point on the line and $(a, b, c)$ is the direction vector.
3. **Identify point and direction vector:**
From the given equation:
- Point on the line: $P_0 = (2, 2, -1)$
- Direction vector: $\vec{d} = \langle 3, 2, 4 \rangle$
4. **Write the vector equation:**
The vector equation of the line is:
$$\vec{r} = \vec{r_0} + t\vec{d}$$
where $\vec{r_0} = 2\vec{i} + 2\vec{j} - \vec{k}$ and $\vec{d} = 3\vec{i} + 2\vec{j} + 4\vec{k}$.
So,
$$\vec{r} = 2\vec{i} + 2\vec{j} - \vec{k} + t(3\vec{i} + 2\vec{j} + 4\vec{k})$$
5. **Compare with options:**
Option C matches exactly.
**Final answer:** Option C
$$\boxed{\vec{v} = 2\vec{i} + 2\vec{j} - \vec{k} + t(3\vec{i} + 2\vec{j} + 4\vec{k})}$$